JPEG to JPG Converter

In the early 1990s, MS-DOS imposed a hard limit on filenames: eight characters for the name, three for the extension. When the JPEG standard was formalized, its full name — .jpeg — was four characters, one too many for DOS. Developers shortened it to .jpg, and that three-letter version became the default on Windows systems for the next three decades. Unix and Mac systems had no such restriction, so they kept .jpeg. Both extensions refer to exactly the same image format and contain identical data.

Today that history creates a practical problem. Software written at different times and by different teams often hardcodes which extension it accepts. An upload form built in 2008 might check for .jpg and reject .jpeg. A 2023 API might do the opposite. The image data is valid either way, but a string comparison on the extension causes a failure. This is the entire reason this converter exists.

When you drop a .jpeg file here, the browser decodes the JPEG image data, draws it onto an HTML Canvas, and exports a new file with the .jpg extension at 95% quality. The visual difference between input and output is imperceptible — you are not changing the image, only the label on the container. The resulting .jpg will open in every program, pass every validator, and upload to every platform that accepts JPEG images.

If you find yourself doing this conversion frequently, it's worth checking whether your source — a camera, scanner, or app — has a setting to control which extension it uses. Most modern cameras let you choose between .jpeg and .jpg in their file naming settings. Changing it at the source saves you the conversion step entirely.